Why does coverage vary by finish type?

Different finishes have different viscosities and solids content. Thin oils like Danish oil spread farther per coat; thicker finishes like lacquer or paint build faster but cover less area per quart.

Should I include both sides of a board?

Yes, if both sides are finished. Use the quick-calc to multiply pieces × surfaces per piece. For a tabletop with a finished top and unfinished underside, set surfaces per piece to 1.

What does the waste factor account for?

Waste covers spillage, brush/roller absorption, uneven application, and touch-ups. A 10% factor is typical; increase to 15–20% for rough or porous wood that absorbs more finish.

How do I convert quarts to liters?

One US quart equals 0.946 liters. The calculator shows all three units — quarts, gallons, and liters — so you can match the container size available at your local store.

Are these coverage rates for raw wood?

Yes, the rates assume unsealed raw wood on the first coat. Subsequent coats on a sealed surface typically spread farther; these figures give a safe estimate for the full job.

Wood Finish Coverage Calculator

Calculate how much stain, polyurethane, oil, varnish, or paint you need for any woodworking project.

Project Details

Surface Area

Finish Type

Number of Coats

Waste Factor

Price per Quart (optional)

Enter your project details and click Calculate

Finish Type Reference

Finish	Coverage (sq ft/qt)	Dry Time	Typical Coats
Polyurethane	125	2–4 h	2–3
Wood Stain	150	1–2 h	1–2
Danish Oil	200	6–8 h	2–3
Tung Oil	175	24 h	2–4
Lacquer	100	30 min	3–4
Paint (wood)	100	1–2 h	2

Summary

Enter your surface area, choose a finish type, set the number of coats, and get the exact quantity to buy — in quarts, gallons, or liters — plus an optional cost estimate.

How it works

Enter the surface area directly in sq ft or sq m, or use the quick-calc fields (length × width × pieces × surfaces per piece).
Select the finish type — each type has a known coverage rate per quart.
Set the number of coats and an optional waste factor (default 10%).
The calculator outputs total finish needed in quarts, gallons, and liters, rounded up to the nearest purchasable unit.
Optionally enter a price per quart to get a cost estimate.

Use cases

Estimate stain quantity for a deck, table, or cabinet project before buying.
Compare how much polyurethane vs. danish oil you need for the same surface.
Plan a multi-coat finish job and avoid buying too little or too much.
Calculate total material cost when budgeting a woodworking project.

Frequently Asked Questions

Last updated: 2026-06-15 · Reviewed by Nham Vu